/* ===== page-news 专属样式 ===== */
.page-news {
  --news-accent: var(--color-accent, #ff6600);
  --news-primary: var(--color-primary, #1a2a6a);
  --news-line-width: 3px;
  --news-dot-size: 14px;
  --news-marker-width: 52px;
  --news-card-radius: 6px;
  --news-transition: var(--transition-base, 0.2s ease-in-out);

  background-color: var(--color-neutral-light, #f5f5f5);
  padding-bottom: var(--spacing-xl, 4rem);
}

/* ---------- 面包屑 ---------- */
.page-news .breadcrumb {
  max-width: var(--container-max-width, 1200px);
  margin: 0 auto;
  padding: var(--spacing-md, 1rem) var(--spacing-md, 1rem) 0;
  font-size: var(--font-size-small, 0.875rem);
  color: var(--color-gray-medium, #888);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
}
.page-news .breadcrumb a {
  color: var(--color-gray-medium, #888);
  text-decoration: none;
  transition: color var(--news-transition);
}
.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  color: var(--news-accent);
  text-decoration: underline;
}
.page-news .breadcrumb-sep {
  margin: 0 var(--spacing-xs, 0.25rem);
  user-select: none;
}
.page-news .breadcrumb-current {
  color: var(--news-primary);
  font-weight: 600;
}

/* ---------- 页面标题 ---------- */
.page-news .page-heading {
  max-width: var(--container-max-width, 1200px);
  margin: 0 auto;
  padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem) var(--spacing-md, 1rem);
}
.page-news .page-heading-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: var(--font-size-h1, 3rem);
  font-weight: 700;
  color: var(--news-primary);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.page-news .page-heading-desc {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: var(--font-size-body, 1rem);
  color: var(--color-gray-medium, #888);
  max-width: 640px;
  margin: 0;
  line-height: 1.6;
}

/* ---------- 顶部氛围图 ---------- */
.page-news .hero-image {
  max-width: var(--container-max-width, 1200px);
  margin: 0 auto var(--spacing-xl, 4rem);
  padding: 0 var(--spacing-md, 1rem);
}
.page-news .hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--news-card-radius);
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

/* ---------- 板块通用 ---------- */
.page-news .timeline-section {
  max-width: var(--container-max-width, 1200px);
  margin: 0 auto;
  padding: 0 var(--spacing-md, 1rem) var(--spacing-xl, 4rem);
}
.page-news .timeline-section:last-of-type {
  padding-bottom: 0;
}

.page-news .section-title {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md, 1rem);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  padding-bottom: var(--spacing-sm, 0.5rem);
  border-bottom: 2px solid var(--news-accent);
}
.page-news .section-number {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--font-size-h2, 2.25rem);
  font-weight: 700;
  color: var(--news-accent);
  line-height: 1;
  letter-spacing: -0.03em;
}
.page-news .section-label {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: var(--font-size-h2, 2.25rem);
  font-weight: 700;
  color: var(--news-primary);
  line-height: 1.15;
}
.page-news .section-intro {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: var(--font-size-small, 0.875rem);
  color: var(--color-gray-medium, #888);
  margin: 0 0 var(--spacing-lg, 2rem);
  max-width: 560px;
  line-height: 1.6;
}

/* ---------- 时间轴容器 ---------- */
.page-news .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 0;
}

/* ---------- 时间轴条目 ---------- */
.page-news .timeline-item {
  display: flex;
  align-items: stretch;
  gap: 0;
  position: relative;
}

/* ---------- 时间轴标记区 ---------- */
.page-news .timeline-marker {
  flex: 0 0 var(--news-marker-width);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 28px; /* 与卡片顶部对齐 */
}
/* 竖线 */
.page-news .timeline-marker::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: var(--news-line-width);
  background: var(--news-accent);
  transform: translateX(-50%);
  border-radius: 2px;
}
/* 最后一个条目标记竖线在圆点处截断 */
.page-news .timeline-item:last-child .timeline-marker::before {
  bottom: auto;
  height: 28px; /* 只延伸到圆点位置 */
}
/* 编号 */
.page-news .timeline-number {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 1rem;
  font-weight: 700;
  color: var(--news-primary);
  background: var(--color-neutral-light, #f5f5f5);
  padding: 0 2px;
  position: relative;
  z-index: 1;
  line-height: 1.4;
}
/* 圆点 */
.page-news .timeline-dot {
  width: var(--news-dot-size);
  height: var(--news-dot-size);
  background: var(--news-accent);
  border: 3px solid var(--color-white, #fff);
  border-radius: 50%;
  position: relative;
  z-index: 2;
  box-shadow: 0 0 0 2px var(--news-accent);
  margin-top: 4px;
  flex-shrink: 0;
}

/* ---------- 时间轴卡片 ---------- */
.page-news .timeline-card {
  flex: 1;
  min-width: 0;
  margin: 0 0 var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  padding: var(--spacing-lg, 2rem);
  background: var(--color-white, #fff);
  border-radius: var(--news-card-radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  transition: box-shadow var(--news-transition), transform var(--news-transition);
  position: relative;
}
.page-news .timeline-card:hover {
  box-shadow: 0 6px 28px rgba(0,0,0,0.10);
  transform: translateY(-2px);
}
.page-news .timeline-item:last-child .timeline-card {
  margin-bottom: 0;
}

/* 卡片标签行 */
.page-news .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs, 0.25rem);
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-news .tag {
  display: inline-block;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 3px;
  background: var(--news-primary);
  color: var(--color-white, #fff);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.page-news .tag-outline {
  background: transparent;
  color: var(--news-primary);
  border: 1px solid var(--news-primary);
}

/* 卡片标题 */
.page-news .card-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: var(--font-size-h3, 1.5rem);
  font-weight: 700;
  color: var(--news-primary);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  line-height: 1.3;
}

/* 卡片摘要 */
.page-news .card-summary {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: var(--font-size-body, 1rem);
  color: var(--color-neutral-dark, #1a1a1a);
  line-height: 1.7;
  margin: 0 0 var(--spacing-md, 1rem);
}

/* 卡片媒体 */
.page-news .card-media {
  margin: 0 0 var(--spacing-md, 1rem);
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-neutral-light, #f5f5f5);
}
.page-news .card-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* 卡片链接 */
.page-news .card-link {
  display: inline-block;
  margin-top: var(--spacing-xs, 0.25rem);
}

/* ---------- 返回顶部 ---------- */
.page-news .back-to-top-wrap {
  max-width: var(--container-max-width, 1200px);
  margin: var(--spacing-xl, 4rem) auto 0;
  padding: 0 var(--spacing-md, 1rem);
  text-align: right;
}
.page-news .back-to-top-link {
  text-decoration: none;
}

/* ========== 响应式：桌面（≥768px） ========== */
@media (min-width: 768px) {
  .page-news .page-heading {
    padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem) var(--spacing-lg, 2rem);
  }
  .page-news .page-heading-title {
    font-size: 3.5rem;
  }
  .page-news .page-heading-desc {
    font-size: 1.125rem;
  }

  .page-news .hero-image {
    padding: 0 var(--spacing-lg, 2rem);
    margin-bottom: var(--spacing-xl, 4rem);
  }

  .page-news .timeline-section {
    padding: 0 var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  }

  /* 时间轴标记区加宽，编号更大 */
  .page-news .timeline-marker {
    flex-basis: 72px;
    padding-top: 36px;
  }
  .page-news .timeline-number {
    font-size: 1.25rem;
  }
  .page-news .timeline-dot {
    width: 18px;
    height: 18px;
  }

  .page-news .timeline-card {
    margin-left: var(--spacing-lg, 2rem);
    padding: var(--spacing-xl, 4rem);
  }

  /* 有图卡片内图片与文字并排 */
  .page-news .card-media + .card-link,
  .page-news .card-summary + .card-media {
    margin-top: var(--spacing-md, 1rem);
  }

  /* 让卡片内的图片在桌面可浮在右侧 */
  .page-news .timeline-card:has(.card-media) .card-summary {
    max-width: 65%;
  }
  .page-news .timeline-card:has(.card-media) {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg, 2rem);
  }
  .page-news .timeline-card:has(.card-media) .card-tags,
  .page-news .timeline-card:has(.card-media) .card-title,
  .page-news .timeline-card:has(.card-media) .card-summary,
  .page-news .timeline-card:has(.card-media) .card-link {
    flex: 1 1 100%;
  }
  .page-news .timeline-card:has(.card-media) .card-media {
    flex: 0 0 280px;
    margin: 0;
    order: 2;
    align-self: flex-start;
  }
  .page-news .timeline-card:has(.card-media) .card-summary {
    max-width: none;
    flex: 1;
    order: 1;
  }
  .page-news .timeline-card:has(.card-media) .card-link {
    order: 3;
  }

  /* 最后一条竖线截断 */
  .page-news .timeline-item:last-child .timeline-marker::before {
    height: 36px;
  }

  .page-news .section-number {
    font-size: 3rem;
  }
  .page-news .section-label {
    font-size: 3rem;
  }
}

/* ========== 大桌面（≥1024px） ========== */
@media (min-width: 1024px) {
  .page-news .timeline-marker {
    flex-basis: 88px;
    padding-top: 40px;
  }
  .page-news .timeline-number {
    font-size: 1.5rem;
  }
  .page-news .timeline-dot {
    width: 20px;
    height: 20px;
  }
  .page-news .timeline-card {
    margin-left: var(--spacing-xl, 4rem);
  }
  .page-news .timeline-card:has(.card-media) .card-media {
    flex-basis: 320px;
  }
  .page-news .timeline-item:last-child .timeline-marker::before {
    height: 40px;
  }
}

/* ========== 窄屏溢出保护 ========== */
@media (max-width: 480px) {
  .page-news .timeline-marker {
    flex-basis: 40px;
  }
  .page-news .timeline-card {
    margin-left: var(--spacing-sm, 0.5rem);
    padding: var(--spacing-md, 1rem);
  }
  .page-news .timeline-number {
    font-size: 0.875rem;
  }
  .page-news .timeline-dot {
    width: 12px;
    height: 12px;
    border-width: 2px;
  }
  .page-news .section-title {
    flex-wrap: wrap;
    gap: var(--spacing-xs, 0.25rem);
  }
  .page-news .section-number {
    font-size: 1.75rem;
  }
  .page-news .section-label {
    font-size: 1.75rem;
  }
  .page-news .page-heading-title {
    font-size: 2rem;
  }
  .page-news .breadcrumb {
    padding-left: var(--spacing-sm, 0.5rem);
    padding-right: var(--spacing-sm, 0.5rem);
  }
}